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Proceedings Paper

Analysis of defocusing thermal effects in optical systems
Author(s): Monica Olivieri; Silvano Pieri; Andrea Romoli
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Paper Abstract

This paper describes a general approach to the analysis of thermal effects in optical systems. The lenses shape, refractive indices and spacings change with the temperature, changing also the focal length and shifting the image position. The temperature variation can be very critical in infrared systems, because the refractive index of infrared materials is more sensitive to the temperature than that of optical glasses, and there are only few materials allowing a thermal passive compensation. Therefore it is very important to consider the thermal defocusing in choosing the optical configurations. In this work the analysis of defocusing thermal effect is divided in two different parts. In the first part, suitable first order relationships are developed, in order to connect focus shift with temperature and to determine first order configurations, taking into account thermal defocusing. In the second part, a recursive algorithm, implemented in a suitable computer routine, is developed to include, during the raytracing, the thermal defocusing in the aberration set and to control it during the optimization process.

Paper Details

Date Published: 23 August 1996
PDF: 10 pages
Proc. SPIE 2774, Design and Engineering of Optical Systems, (23 August 1996); doi: 10.1117/12.246670
Show Author Affiliations
Monica Olivieri, Officine Galileo (Italy)
Silvano Pieri, Officine Galileo (Italy)
Andrea Romoli, Officine Galileo (Italy)


Published in SPIE Proceedings Vol. 2774:
Design and Engineering of Optical Systems
Joseph J. M. Braat, Editor(s)

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